摘要
以θ-Al2O3为载体,采用浸渍法制备了PdO/θ-Al2O3和PdO/CeO2/θ-Al2O3催化剂,比较了催化剂的CO氧化活性和热稳定性。运用X射线粉末衍射(XRD),程序升温还原(H2-TPR),拉曼光谱(Raman),CO化学吸附和物理吸附(BET)等技术对催化剂进行了表征。结果表明,PdO/θ-Al2O3催化剂经过1000℃焙烧后CO氧化活性较低;而PdO/CeO2/θ-Al2O3催化剂经过1000℃焙烧后CO氧化活性反而高于500℃焙烧的活性。CeO2能有效提高PdO/CeO2/θ-Al2O3催化剂的热稳定性,在10 h的稳定性实验中无失活现象发生。PdO/CeO2/θ-Al2O3-1000催化剂具有最高的转换频率(TOF=3.36 s-1)。
The CO oxidation performance and thermal stability of PdO/θ-Al2O3 and PdO/CeO2/θ-Al2O3 eat- alysts prepared using θ-Al2O3 as support by impregnating method were studied. The catalysts were further characterized by X-ray diffraction （XRD）, tempera- ture-programmed reduction （TPR）, Raman technique, CO chemisorption and Brunauer-Emmett-Teller （BET）. It was found that the PdO/θ-Al2O3 catalyst calcined at 1000 ℃ showed lower activity, whereas the PdO/CeO2/0-A1203 showed higher activity than the catalysts calcined at 500 ℃. CeO2 could improve the thermal stability of PdO/CeO2/θ-Al2O3 catalyst The PdO/CeO2/θ-Al2O3-1000 catalyst had the highest turnover frequency （ TOF = 3.36 s ^- 1 ） , and showed no inactivation after 10 h reaction
出处
《中国稀土学报》
CAS
CSCD
北大核心
2013年第6期653-658,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金资助项目(21203167)
